no. a.] PSYCHOLOGICAL EXAMINING IN THE UNITED STATES ARMY. 



837 



Table 383. 



-Intelligence and occupation. Foot-rule coefficients of correlation of occupational groups common to the 

 studies from Camp Wadsworth and of the Surgeon General's Office. 



Occupations are ranked according to median alpha scores. 



Occupation. 



Draftsman 



Mechanical engineer 



Clerk 



Telegrapher 



Photographer 



Farrier 



Telephone operator 



Auto engine mechanic . . 



Electrician 



Policeman 



Butcher 



Plumber 



Pipefitter 



Blacksmith 



Gunsmith 



Machinist 



Baker and cook 



Chauffeur (heavy truck) 



Painter 



Carpenter 



Fanner 



Teamster 



Barber 



Laborer 



Surgeon General's 

 study. 



Median 



raw 

 alpha. 



114 

 110 

 96 

 85 

 86 

 73 

 70 

 66 

 81 

 69 

 61 

 66 

 66 

 61 

 66 

 63 

 59 

 58 

 59 

 60 

 48 

 50 

 55 

 47 



1 



2 



3 



5 



4 



7 



8 

 11.5 



6 



9 



15.5 

 11.5 

 11.5 

 15.5 

 11.5 

 14 



18.5 

 20 

 18.5 

 17 

 23 

 22 

 21 

 24 



2.5 

 1 



.5 

 1.5 



iS= +0.S2 



r= +0.96 



Sum of gains=17.0 



The striking similarity in ranking of the occupations common to these studies speaks for 

 the general reliability of the results for those occupations. Specifically it indicates that any 

 selective factors that may have been operative in determining the nature of Army occupational 

 groups were generally operative. That is to say, in the various camps the same general condi- 

 tions prevail. From the practical point of view of the Army our belief is strengthened that the 

 table of occupational intelligence standards can be used in the Arnry with resulting increased 

 efficiency in the placement of men. 



It is in point to mention briefly in this chapter two studies made in Washington by the 

 Section of Psychology during the winter of 1918-19. 



One hundred and six employees of the Civil Service Commission, who had been selected with 

 unusual care and retained for several months and in many oases for several years, were given 

 group examination alpha. Since unsatisfactory employees would not have been retained it is 

 to be presumed that the group is a competent group. The civil-service ratings, assigned in per- 

 centages on the basis of examination at the time of entry into the civil service range from 70 to 94. 

 The median alpha score for this group is 150 with extremes of 199 and 70. For the entire group 

 the correlation of alpha score with civil-service rating is +0.48. For a group of 73 who are 

 classified as clerks, the correlation is +0.53. 



In a group of 106 graphotype operators of the Treasury Department, the median alpha 

 score is 75 with extremes of 11 and 174. The median of the average daily output of plates by 

 this group is 245 with a median error of 2.9 per cent. The highest individual average is 391 

 plates per day; the lowest, 113. The correlation between output and accuracy is +0.113; 

 between alpha and accuracy, +0.019; and between alpha and output, —0.087. The returns 

 are of special interest in that they exhibit such low correlations between intelligence and accuracy 

 and speed in mechanical work. 



